twa + dump = sbwait

Hi!


I can't use dump at -CURRENT with twa. The process goes to sbwait
state forever. Here are the details.

$ uname -a
FreeBSD test.ipt.ru 7.0-CURRENT FreeBSD 7.0-CURRENT #0: Sat Sep 15 19:37:17 MSD 2007     bsam_at_test.ipt.ru:/usr/obj/usr/src/sys/TEST  amd64

The controller:
twa0: <3ware 9000 series Storage Controller> port 0x3000-0x30ff mem 0xd8000000-0xd9ffffff,0xda300000-0xda300fff irq 16 at device 0.0 on pci8
twa0: [GIANT-LOCKED]
twa0: [ITHREAD]
twa0: INFO: (0x04: 0x0053): Battery capacity test is overdue: 
twa0: INFO: (0x15: 0x1300): Controller details:: Model 9650SE-8LPML, 8 ports, Firmware FE9X 3.06.00.005, BIOS BE9X 3.06.00.002

Two disks at stripe:
da1 at twa0 bus 0 target 1 lun 0
da1: <AMCC 9650SE-8LP DISK 3.06> Fixed Direct Access SCSI-5 device 
da1: 100.000MB/s transfers
da1: 476816MB (976519168 512 byte sectors: 255H 63S/T 60785C)

Mounted as:
/dev/da1    /s  ufs rw 2 2

The command:
$ dump -0Luan -f s.dump /s
  DUMP: Date of this level 0 dump: Mon Sep 17 10:26:21 2007
  DUMP: Date of last level 0 dump: the epoch
  DUMP: Dumping snapshot of /dev/da1 (/s) to s.dump
  DUMP: mapping (Pass I) [regular files]
  DUMP: mapping (Pass II) [directories]
  DUMP: estimated 432054 tape blocks.
  DUMP: dumping (Pass III) [directories]
  DUMP: dumping (Pass IV) [regular files]
[wait here forever]

The relevant part of iostat -w 10 and top:
-----
      tty             da0              da1             cpu
 tin tout  KB/t tps  MB/s   KB/t tps  MB/s  us ni sy in id
   0  231 16.00   0  0.01  16.00 152  2.37   0  0  1  0 99
   0  257 16.00   1  0.02  16.00 147  2.29   0  0  1  0 99
   0  310 16.00   1  0.01  16.00 146  2.28   0  0  1  0 99
   0  265 16.00   0  0.01  16.00 152  2.38   0  0  1  0 99
   0  442 16.00   0  0.00  15.98 299  4.66   0  0  1  0 99
   0  620 15.54   3  0.04   3.46 1999  6.76   0  0  2  1 96
   0  363 16.00   0  0.01   2.77 5141 13.90   0  0  5  2 93
   0  309  0.00   0  0.00   3.22 114  0.36   0  0  0  0 100
   0  260 16.00   1  0.01   0.00   0  0.00   0  0  0  0 100
   0  263  0.00   0  0.00   0.00   0  0.00   0  0  0  0 100

last pid: 74610;  load averages:  0.01,  0.06,  0.01    up 1+09:53:34  10:32:34
98 processes:  98 sleeping
CPU states:  0.0% user,  0.0% nice,  0.3% system,  0.0% interrupt, 99.6% idle
Mem: 113M Active, 2374M Inact, 337M Wired, 480K Cache, 214M Buf, 4935M Free
Swap: 4096M Total, 4096M Free

  PID USERNAME  THR PRI NICE   SIZE    RES STATE  C   TIME   WCPU COMMAND
74595 duser       1  20    0 28248K 26000K pause  5   0:01  0.00% dump
74596 duser       1  20    0 28248K 26000K pause  2   0:01  0.00% dump
74594 duser       1  20    0 28248K 26000K pause  5   0:01  0.00% dump
74593 duser       1   4    0 28248K 26020K sbwait 7   0:01  0.00% dump
74530 duser       1   8    0 28248K 26000K wait   6   0:01  0.00% dump
74443 duser       1   8    0  6216K  1904K wait   5   0:00  0.00% sh
-----

Gdb shows nothing interesting:
# gdb dump 74593
GNU gdb 6.1.1 [FreeBSD]
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "amd64-marcel-freebsd"...(no debugging symbols found)...
Attaching to program: /sbin/dump, process 74593
Reading symbols from /lib/libc.so.7...(no debugging symbols found)...done.
Loaded symbols for /lib/libc.so.7
Reading symbols from /libexec/ld-elf.so.1...(no debugging symbols found)...done.
Loaded symbols for /libexec/ld-elf.so.1
0x000000080071b34a in read () from /lib/libc.so.7

Shall I do some more debugging? Thanks!


WBR
-- 
Boris Samorodov (bsam)
Research Engineer, http://www.ipt.ru Telephone & Internet SP
FreeBSD committer, http://www.FreeBSD.org The Power To Serve